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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b51227d0cc0f72f723218951675762cf8632a324170e98c8e6362050b317a649' 
  AND token = 'xM7D9ZbIMH/asWqQhNwOFaBdtLO6XClcjs7++T30Dq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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