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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83ea0828a7327e0b5ecebaf133ce0d92c68da68f4bb0bf0041218b4de7d6e93' 
  AND token = 'p2oNecGQUE8wVfUbizsWIscZxtA/uUTSxKQqMyXv8lY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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