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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e89ca567af34c36d54f18a2197c84f131f2e64ee0ed56da788076845763b4d0' 
  AND token = '8lovqA74vMKEB8WT5GRMe71adgSKS/Skf7fDMlaGVhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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