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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3500f927bf21e99c24294d3ab097438384b45d695f01c43d2f9cd8a8df51366d' 
  AND token = '4HhMrqStbploonb8NTdRjpXVmfrSIG8qVrLNjj0WfjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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