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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e4e4bd99fa872a5df46ff9be651a6662332d4bef911fe0ad6fb54a4c34e9dc' 
  AND token = 'bXRdmc2ysdcSUWoKxLlx4ZJsF8xOpHws/VQgHajGlPI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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