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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7db3f2e7a334277c66342b5f5dab3d83056a37d0ba86794023af34a7153cde6' 
  AND token = 'ewG/qgxf4nbhuIA5dABSg93ZQLXi25x32zT6onXN24Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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