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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbd61e142a8cd178e95d3b13f219406f13bafd2c8f4f08fd30d056414d8f143e' 
  AND token = '6tSpp88xWwWtJ+rUXEYnXtxnrNT1qim+OrjADQ4TCTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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