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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7302ade2ad652df07e6a9faeb115be51f1093ccea07ec71589a4c7f003a163c6' 
  AND token = 'PMeqry6IXHp2yUvYWX0zFUBHwxXqZ/J4v1YeK7HqxYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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