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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54787c06cef25329c9703e52b16b7b3b7b19dda395eb0959dd447912d8c0cb62' 
  AND token = 'rX+D9yibBVpPXeCcnMvrYiaQc+Thpg0fA7KZlEoqWJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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