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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cecf97da47457b8d13c9d366ca9585353bf91e826c3c8ab9f88d6292d1c67bd9' 
  AND token = 'w8z1X2fqzRB/ibbu2jlltxuCjxjXq7b3dMMxnaCf05I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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