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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512dbadea1102cb95e8921aa2728df5ee6500872e611df3035c7e335c7aa8e29' 
  AND token = 'LNpT8zS6DgsVEpvKeOm5hbfCuF8JAJP6m3NZ8LOrDFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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