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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1a24550841245caa79b0ee56ee3ac80e723c512e3b7ad47be797843b7e50605' 
  AND token = '8//r92PuHIFWk7oT4Z/tEViBZayWP9zIwkG9fzFKdMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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