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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1de709fcdbdc57402fe1f263985aa9f3690e870652042618bd685e11abab3c13' 
  AND token = 'bWym5h6dEX8vKY+zd3e+3g6h+/WbLJEXmpv0RxavsG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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