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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bd83d91e8a591b8328eb06e17c09be306b11ae39c64fae08329ec010ef86a8' 
  AND token = 'WmR9O1cq2QWUMZWhbiR+VW4ig9uIcAsGT+fSNh7aQ68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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