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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c57e68ba29d9358f4c21a21354de2809b6dc7c1ccdb42abbeb4e598ee3c8ff' 
  AND token = '8SWn73ncQoGQDX/TOOr9b6xvb67b0MfzOnGbpEugL0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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