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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b7212b9a93173b645557d45ce2c8d600a17d501339260accd2a562b04d519a9' 
  AND token = 'b0N+d3HIcWn8h+141tYTwVNMGDBznUsQvaU4n6ZE0DQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00339

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}