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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6782b19369fdb0a75e1d407f79214fcd6dc4fe433b39708157d9d2596fa68051' 
  AND token = '2wa1QMURTKIo+MHqrylLu7G1+EqahuCkt1ePGQIjVno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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