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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '112f30f4098a586f38254d0d6a1bfb77523de3c826e1f86bd7fa35b5b4856770' 
  AND token = 'ldeoTgcHZe3cDRLX2ll8DHxytWKHuVSH8BXs4prBqz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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