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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512a6e5db430c974b95e8e4c7e7d2319742693aba02e3528ac3248fe5ba13f4a' 
  AND token = 'ibxpw0INdo2JA2psi+Tp8KduH0tE3vJ+xMR75kcI9zY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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