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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddb198955cc8656355666d96d788001c2fddaf6d977cb4a1749e1f2cd3a1ab26' 
  AND token = 'oS9LXJKlgHaKw5DMdM4U3bWifDw+fKt4J4mB0oXNOTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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