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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9802a2dc8adf1b78539cfe5641ec8d5795912b1c9d7d7e118a8f2ea42fd187fb' 
  AND token = 'SfJqskAkjkIFFcDXqDe3zzl6hoAsASocv8peQDwN4SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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