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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afadc789664055b7c66d3abbec029cf63299e7604fa840c7d805a8a58d1a10ac' 
  AND token = 'FiBmDYDSML6vM8Vvq2jOVdPcz3W1rEhYp266hKz/b04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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