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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd352435f0b0e07284d053e305f41ac5d02a60bf3915668f4abd7be833fab036' 
  AND token = 'bU8NSmM8j/A0OBiJ+M4ibvMBzc6otN84fAM8K8yt2OU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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