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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3673eb5d8f610980072435d054b2f488f13ae7d91e196cc77584ce9ff510668a' 
  AND token = 'snP/orCAN2jAe0hCDStxHylcbkHpz2mz2SD+LygNlGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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