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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90ff633f249ee02f39c6449252d09d4e4779e4308a34935dd472720adbaebfac' 
  AND token = '4X/7DGy1mZ532HzQw61PwndHO+0gYXBCAZQH8ClXoN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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