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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b20dbc1b5cc341675a7ef605444b911ce0f1ec6b3ea721fe7496d8eb84567813' 
  AND token = 'IbyEvKnksE24+rmLIEMI1zMuGglT0TDackorKC8uyhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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