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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7e047f371c766701dfcb3cae0a0bff6b673c095045a1dc2fbd25ea596ed8d7' 
  AND token = 'HZJaBMeZCXigXysnnk01y9OL4iBysdkI3H5VOHB5hDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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