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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76d4b6a107b874acc37ae18d16e49588398414690ce3fa3818531f246c9e9ce7' 
  AND token = 'dUzH0SrXXmBF36oJ3vDA9A+DvzUKGbLxFbZkbfVl7mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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