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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6edcec95274e364cf15d3377d5c92831d59bf7dfa4020b29e3fcd595249aba8' 
  AND token = 'YeaK6pOA8+0gdhdKwIaLaNF9A80C3ai3G3m5/M8YzMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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