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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc46ec8b4a0731e6382fa5d32175a6de7babc421bec502bfe418f6873d3199e6' 
  AND token = 'at+F3gutllkP9H9tRMjMkGaXv99vwgCnTnQwU78DKzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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