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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2348607a337b13798399b4d90f1927df7abc0a2da4dec33360f94522e15edb' 
  AND token = '2RLbD6CrLlzneZDhjspcHMbhWrGC+SnoQeXg1ogsFTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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