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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee160b1e2594b9c4aec6c2535c629672ba4afa26933fb69383ce219fb8814ffe' 
  AND token = 'f3pV6VN3yereA6GYH8E8Mpf8uWOGGWxkzERYAWEA3Yc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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