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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d9605e92366fe53fc7fa6fcc4d761e2635ff497efc35f9f8223fb7356866b7d' 
  AND token = 'gEr60czXTY/h4orGSRWe+hgif03pEoBTCzzVA6hBn8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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