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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe8314b8e1507f9735a90543163a520d750c6f63b8ed673625c1e3cb52108c64' 
  AND token = 'N2zlbTl3trhGw+SWAaD5Z84hzHVoRoIHB37F3SU0TeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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