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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae86b18fdc56e75a9b1034cd4092062e318d03d0b6377b0bb3d7468fe7017a82' 
  AND token = 'g20uZqE5oofzDlAsweXYgxKueA2BErQ1ysa/Bw5LwXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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