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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a55cfa0e308e1d7d1c3467a69e51e803109ed574ec0e9376a22b8fcd885ee9' 
  AND token = 'MsmKyYdv0kZxO63GDHKx1iDo+KhaHW4fv5NHLmO2FFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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