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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ef7284a48b557db17436156c95e892fa60a8445589c252f9ce494d4ad32959' 
  AND token = 'SIHLPG0igY/adC8sslM3AuO1Nbr/OAZUgJUnGdOGWCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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