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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f92c077a92b990a0ebeaef2afd902687d7530d7ddac0ac8be58837f405d7ca' 
  AND token = 'wwnX9M5loSdfUT8Bxi+Wbl4cDaQjcZ8W1twJvbNE2Qg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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