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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5be7c2f6b9de88b1260dc36712700a09fb4548e0bb266c452e6e6fb57de5f2c3' 
  AND token = '+zOgU9BAbCaq/339Hk0EzyaaYjZP3lecfgszMKJ9R0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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