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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b23ad7bc274895d2c45fededf27bafa1d6dd23f5f5e3e7d12a8f5f9510b9e86' 
  AND token = 'PC/i9CO4t1/ETjRjPhxvPCaXLXYpK4S7dvs2g57eH5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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