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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e78575da57d86ab3488c8db16c20a97498774af2677c9ae1f649a6a0b464640c' 
  AND token = 'L/zJ9gcWOuPPto6jMhJoPK0go4ACBRrUiIH/LloMoto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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