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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa5a12b37af8affed2de774827da8cc7057d95f87c5878f69ffe1f12e9a5d2bd' 
  AND token = '0k2REsJlpdxn42V7k/w9IlYd6PssUxFyxEgb0Az0sxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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