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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da0d4871d9c837cd8ac6ae8a6bece0a1ffab8405768f8004d9ff0c6b8955dc75' 
  AND token = 'PIRXUASMDCOrBQXXJ6Xh/43Yd7XHc94N/F+GcGqm0RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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