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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020f5ec4ac7aa112df2b827c3c7284f5d588a1be6c1ff009d8e9d9ed25037007' 
  AND token = 'DC6YAXSu8jeEVmyXcbfI+W8Tozyx/clX19jGjIB3ooU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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