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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac7a37ed3873bbbae4ee7cd70f7163e0a7783457beb694ac937ff90f7593aac2' 
  AND token = 'r3pKJLqL3yDYoq5U06S0tbogrLK/yGBGH6F88HZR04c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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