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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adf967ba1e73fbdd0b5a68a6c11751bf8f3e8851128bb7f15f943bab0363416c' 
  AND token = 'na4JEADTt66PqDR9/KV5L7XZoV3kBGmrQS5LPlSx7iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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