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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c93d074bea11f9c30166b5201c37d8c634d44daf219c8c4ac6c64c5ae780a8e2' 
  AND token = 'ekqI8FMShc0G4kLoch/74JNi9I1eB8E1eaHr856QJqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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