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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d15ec6c58498b5c3d08b053c6273d70462945e5a92d204b60e35234496ccf7' 
  AND token = 'owZgZlVou0NujE/zOS2BtNWu1Qn7AXGen2gJff4c/es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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