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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f1f3b8e7e745536ae811c3d355fb7000865ec83366c25a4eb20af089fc8db26' 
  AND token = 'gxccm9p6SKurQtK46kcuSat421pecVnfz27Ev9FP1io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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