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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b05ef4f26204445c1ac39c40e6fc5c0e64fb21abbc7d96862d0a6b7258708fbc' 
  AND token = 'p3OY5MSILvb/ndWg6I+t8RgsRQ6hOtnj6PLndL8oDI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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