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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd177f059c42207d8ff643ee44c5d78b1e736c021b6dd4ae67d106f8c2712c2' 
  AND token = 'MVHJR+0Ua6tukM5uXyrHHOVnQHZPO7zrfKunM9SOmj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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