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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a82019890acc6cc53b6d3a1a97dc1f1a34bd360aaabe886c739041ce8cad6ce' 
  AND token = 'b9dgvdwcYtwYy8nNZX6QUtHv380UTUs/dUeV2dNsdaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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