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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44abf68cf591ca352d42508f6f48e368f33e384f13baa5937f3f6479f31f9353' 
  AND token = 'D3gbPXfXa7eALRHzyGQAJdYOVZ4ymOqGchdEXO8IQGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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