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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6d969e3e1d61509c9246affc9578a40eb639415cd03d7d1f298839abafd524' 
  AND token = 'FJ0vITmXfdG08ZBTrRr3BUR7perBnsLvASvGsjCt4c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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