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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '585a4783e15e2a58576613f34698184977f5a0638ae29ac8b3ea3afdb1d17904' 
  AND token = 'gdiZe0x0oCvCp5KDL8ldK6F9eH3e0dfnHovEZ92jV7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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