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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff8f40eb22f06ba2f36eb082556d2f3d3309f831591e662174b5f6a1b30945ff' 
  AND token = 'zNdZlU6QcIX7uJBb2gMkCAR0shTk0uEaw2s83Af3WSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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