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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f71d906fabcf3496c5ba379145ed87afd757a6816eb8ff9869c8f7fcb80b59' 
  AND token = '4ggoCZD72CWpxV4FNawwqsQs3kT6r6+ZrELiWvL6o9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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