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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd40ceea86a1b5849c8a98e8862037f03ef8bd2cd741d6cbdceda3b44fd08588' 
  AND token = 'vbytctorN/Dpjxk9VztZAOGvQztW82T453gnytpVd50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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