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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada513cd8e3be916d44f2e4f142193557ac7ca9b39d4cd668279ee438ebe5940' 
  AND token = 'vT0cQacrg8Z5b4SaCXA/IjDwNf0Zy44urqLuMomeJE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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