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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7566af746b9749a2537f0e35a3df997a47b70faeb3173e62562fd3ad7700ca56' 
  AND token = 'BPTj646DrNz3PV4XXdaxZu58iXX7b4Ue5YLvJcepljs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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