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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cfed0acef39564d73d03c660590064e5aefa2063a7c6c358fc104ae3235305' 
  AND token = '1k8sGfVpSLszv6wM3tJ4TT0kjCTmJt+EPUK5bou2GAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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