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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92b7029664396b0f1bf590476e4f1606d776fb4b4794bc8d1250f58c1d189438' 
  AND token = 'lSMEtULdo2zRtGkp4f1fMwkHTBLICay8BcACNsnBAD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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