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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ab1afdb3d4e7f9214fd0ab5ccfcf2789642f32fa96d63416fbd08de6d155c29' 
  AND token = 'YyJCXQUo8rN1LnO5U3YJMSw8NWOF7rupVaK48c3EZrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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