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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ade330007e10b2cf255d1068b9817098a3c50b24c9400a27e2fd04eca6f9f1' 
  AND token = 'a2p/zcLMnw4TjMMvuprcy7bIZHPtelnC3ItTAFzVfxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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