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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49749ef5d6aa506eced8e5f7719c639306d2df27df8568ba4eb5fa8aeb9e4ab8' 
  AND token = '8XgsrhFG+qjWSw1t2lY9/7PEatT00Y0NGWbu9xUSrRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00123

JSON explain

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