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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84ffcc3a17ed479776d7ecf4168d19397370b2036fea24bd61e6235ba1e3d5f0' 
  AND token = 'mrQZF+qATQIE8UveNErFkpuGVDv9Zwi1Je4QX8Ry7qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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