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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0baaf874a166f62aaec92a63ea3d26fe08d258914cf2198d44d47e5c44bfc675' 
  AND token = '4nEmqJgwKuYT2oqar541TItEhV/DhYFo3IdfnlHw7JQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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