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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c595ab0c487b55d3c440249e465a9dd93db0557c230ff785862eec9fe5735eed' 
  AND token = '2GT/SOmX8HPU1F65LuD5hWq04b46K82y0AUuTB9FX90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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