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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2fb38f23198c2a8fd51f1700b7066c83861ddc95967d6f2ad9b0a26e05629de' 
  AND token = 'qZ1K8bQb9qbBGyR2Ws52nwPYpAufweHrzBHr/xgw65M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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