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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0523efdb4c54d45a672e130c7dede3352cd38a462b3089a574993b93cc0799ba' 
  AND token = 'QsMwACT7XYubT2VqMjLRvAezAj9WNlPCXDp5f0Vsf+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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