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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb9fd9543b85566267c3884efbe81118b58d91d3eaaa19b357e0e4f325371b4' 
  AND token = '0WhmWT/qVw0R0c0kad4g1m1lxM0hVsaAppWOmk18Z6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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