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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f437321d7e88c514fd370f51b43865f8e6c31a12ada5c10dc7a7e241bf0e7f' 
  AND token = 'HWntMP8eVGff0zp9wr087qKhbZKYg7acIffmAtS5JKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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