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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58a20e1153241a73b5cd394c5ed18f552e5b7c6df289245f372cfd35be8adde6' 
  AND token = 'ygC+peMPkqofI0WSqVU+c7/ajtn5yCjEP89LIjR1Xxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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